HP 8560E - Page 125

124 Chapter2
Adjustment Procedures
18. Tracking Oscillator Adjustment (Option 002)
3. Press LINE to turn the spectrum analyzer on. Press AUX CTRL,
TRACKING GENRATOR, SRC PWR ON, AUX CTRL, REAR PANEL, and
10 MHz EXT. Allow the HP 8560E/EC to warm up for at least 5
minutes. Set the controls as follows:
Center frequency ..........................................................300MHz
Span.....................................................................................0Hz
4. Press INSTR PRESET on the synthesized sweeper and set the
controls as follows:
CW .............................................................................4.2107GHz
Power level ..................................................................+12dBm
Frequency standard switch (rear panel) ...........................EXT
5. Set the frequency counter controls as follows:
SAMPLE RATE ................. ................................................FullyCCW
10 Hz — 500 MHz / 500 MHz — 26.5 GHz Switch ....... 10 Hz500 MHz
50 Ω — 1 MΩ Switch ............................. ............. .........................50Ω
6. Remove the dust cap screw used to seal the tracking oscillator
adjustment.
7. On the HP 8560E/EC, press AUX CTRL, TRACKING GENRATOR, MORE
1 OF 3, MAN TRK ADJ, 0, and Hz. Rotate the knob counterclockwise
until FINE TRACK ADJ is set to 0.
8. Record the frequency counter reading in Table 2-13 on page 125 as
F1.
9. On the HP 8560E/EC, press MAN TRK ADJ, 255, and Hz. Rotate the
knob clockwise until the FINE TRACK ADJ is set to 255.
10.Record the frequency counter reading in Table 2-13 on page 125 as
F2.
11.Calculate F
center
as shown below and record in Table 2-13 on page
125.
F
center
= (F1 + F2) / 2
12.Set COARSE TRACK ADJ to 25. This sets the tracking oscillator
near the center of its frequency range (the relationship between the
COARSE TRACK ADJ dac number and the output frequency is
nonlinear). Adjust COARSE TRACK ADJ and FINE TRACK ADJ
until the frequency counter reads F
center
±100 Hz.
13.Record the values of COARSE TRACK ADJ and FINE TRACK ADJ
in Table 2-13 on page 125.